Mold for concrete beams



S. BRUUN.

MOLD FOR CONCRETE BEAMS- APPLHZATION man MAR; 25,1921.

Patented July 25, 1922.

SIGUIRID BRUUN, OF FREDERIKSBERG, DENMARK.

, MOLD FOR CONCRETE BEAMIS.

IAZSQYOS.

Application filed. March 25, 1921.

To all whom, it may concern:

Be it known that I, Siennn BRUUN, a subject of the King of Denmark, and residing at 5 Forchhammersvej, Frederiksberg, Denmark, have invented certain new and useful Improvements in a Mold for Concrete Beams (for which I have obtained patents in Denmark, #522,075, 10-29, 1915; Norway, #29376, 3-28, 1917; Sweden, 15,170, 3-2t, 1917; Finland, 57,892, 3-26, 1919; France, #500,408, March 12, 1920, and filed applications for patents in Belgium, 6-5, 1919; Germany, 12-18, 1919; Switzerland, 6-29, 1920; Italy, 6-30, 1920; Spain, 7-23, 1920, and Austria, 3-3, 1920), of which the following is a statement.

The present invention relates to the manutacture of concrete beams of an J..-shaped section. It is the object of the present invention, by a suitable construction of the mold to facilitate the manufacture of such beams, and also to save in material used for such molds, it being besides rendered possible to turn the beams molded, out from the molds already after a comparatively short time, so as to again use the mold for molding another beam.

The object of the invention is secured in the following manner: The mold in which the head or flange of the .L-shaped beam is made of an U-shaped profile iron on the flanges of which the sides of the mold, prefi erably wooden boards are placed, between which the web of the beam is molded.

Such a mold is not only very easily made, but also affords the advantage that it allows of turning over the molded beam before the latter has even completely set, and likewise of removing the mold therefrom.

In the accompanying drawing a form oi the mold is shown by way oi example.

Fig. 1 is view in perspective of the mold.

2 is a similar view of the molded beam, showing the arrangement of the reinforcing rods.

1 is a U-shaped section iron \vithround corners which serves as mold tor the head or flange ot the .L-shaped beam to be molded. On the flanges of this section iron 1 are placed boards 2 which project somewhat towards the cavity of the iron and thereby produce the required reduction in the cross section of the beam to be molded.

For assembling the mold the section iron 1 is supported at a small distance 'from the floor. The boards 2, to which are bolted straps 3 are then placed on the edges of the Specification of Letters Patent.

PatentedJuly 25, 1922.

Serial No. 455,515.

flanges ot the said iron 1, the lower hooked ends of said straps 3 engaging beneath the iron. Between these hooked ends of straps 3 and the underside of the iron 1 wedges 4 are then driven so that the boards 2 are tightly pressed against the edges of the flanges of iron 1. The straps 3 are, at their upper ends held at a proper distance from each other by means of distance blocks, so that by such means all parts of the mold are secured in their proper, relative position.

After the mold has thus been assembled and the necessary reinforcement rods have been secured therein in known manner, the mold is filled with concrete by grouting or stamping.

lVhen the concrete has partly set, the mold is dismantled by first removing the blocks 5, then driving out the wedges 4: whereupon the straps 3 with the boards 2 are lifted so that they can be removed from the molded beam sideways over the flanges of the iron 1. The molded beam is then turned over on its side, whilst a board or the like is held against that side of the beam which is to lie closest to the floor, so as to receive the shock and distribute it over the whole side surface of the beam. If, in turning over the beam, crowbars or levers are held against this loose side board a shock, on the beam reaching the floor may be completely avoided. It is of importance, for protecting the still partly soft beam, that its flange or head remains still in the iron mold. After the beam has been fully turned over, the said iron may be easily removed from the head, in particular if the hereinbe'fore mentioned loose board laid against the downward side of the beam is of such a thickness, that the iron will not touch the floor.

In place of a U-shaped section iron also the recess in the side o1 an H-shaped section iron may be used, to serve as mold for the head of the JL-shaped beam to be molded.

I claim:

Mold for molding concrete beams of an .L-shaped section consisting of a U-shaped section iron, serving as mold for the head of the concrete beam to be molded, boards, forming the sides of the mold, adapted to be fitted on the edges of the flanges of said section iron, and means for holding the said members of the mold together and in a proper relative position to each other.

In witness whereof he aflixes his signature.

SIGURD BRUUN. 

